Marfan syndrome is a genetic disorder of connective tissue. It is an autosomal dominant disorder, meaning that if someone is homozygous (MM) or heterozygous (Mm) at the locus, they will develop Marfan syndrome. Individuals who are homozygous recessive (mm) do not develop the disease. Globally, the frequency of Marfan syndrome is approximately 1 case per 300 people. Assuming that this locus is at Hardy-Weinberg equilibrium in the human population, calculate the frequency of the M allele. (Your answer should be a number between 0.0 and 1.0, rounded to 4 decimal places.)